Fluid strainer



June 26, 1923.

A. OLIN FLUID STRAINER Filed Feb. 16. 1922 'INVENTOR ueus'r OUN rama .inne a, iaa

AUGUST OLIN, 015' EDA,

COMP :i

ASSIGOB TO ATLAS 'IMPEBIAL 'ENGINE OF OAKLAND, CALI'IIE'OB, A CORPORATION OF CALIFOB.

FLUID STBAINER.

application meu rebmary 1a, 1822. serm no. 588,912.

To all 'whom z't may koncern:

Be it known that I, Anoos'r OUN, a citizen of the -United States, and a resident of the city of Alameda, county of Alameda,

;State of California, have made a new and useful invention-to wit, Improvements in Fluid Strainers; and I do hereby declare the following to be a full, clear, concise, an' exact description of the same.

This invention relates particularly to'a fluid strainer for use on.high pressure apparatuses.

An object of this invention is to provide a high pressure fluid strainedr which may be le used in connectionwith an apparatus for injecting fluid fuel into an internal combustion engine. V v

A further object of the invention consists in providing a. fluid strainer that will ae be Superior in point of simplicity and inp expensiveness'; of construction, positiveness of operation and facility and convenience in use and "general eiiiciency. Other objects and advantages will appear as this descrip- 'ae tion progresses.

In this specification and the annexed drawings, the invention is illustrated in the form considered to be the best, but it is to be understood that the'invention is not limited to such form, because it may be embodied in other forms; and it is also to be under- Stood that in and by the claims following y the description, it is desired to cover the invention in Whatsoever form it may be emte bodied.

In the accompanying one sheet of draw-l m ig. 1 represents a diagrammatical illustration of a high-pressure fluid system haveo inmy strainer interposed therein.

ig. l2 represents a longitudinal section through a strainer constructed in accordance with my invention and taken on the line 2-2 of Fig. 4. ee Fig. 3 represents. a longitudinal section partly in elevation, taken through Fig. 4: on the line 3-3.

Fig. 4 represents a cro' section taken through Fig. 2 on the line 4 4.

Fig. 5 is an enlarged cross section the threaded parts of my strainer.

In the manner of Operating and iniecing fuel into internal combustion engines of the full Diesel type, which may'oesaidto 80 through iippurities. At the present time a low grade iquid hydro-carbon fuel, such as calol or crude oil, is used entirely, which fuel through treatment accorded it by an apparatus used in combination With my invention breaks the said fuel into a finely divided condition to form a homogeneous fuel mixture, readily ignitible when placed Within an engine cylinder, the object being to increase the commercial value of liquid fuels of a relatively low volatility, but which contain a greater heating power per unit and are purchasable at a cheaper price than fuels of a higher gravity.

In detail, the construction illustrated in the drawings includes the cylinder of an internal combustion engine, generally designated by the numeral 1, which cylinder is provided with a conventional mechanism necessary to its operation. The cylinder 1 has a fuel injecting or discharging unit 2' in the head thereof and which comprises a base member 3 drilled centrallv as' at 3' to provide a guide housing for an adjustable needle valve 4, the tape-red end of which seats in a spray nozzle 5 securedi to the end of the member 3, and discommunicates the` apertures or holes in the spray nozzle 5 from the atmosphere. The end of the needle valve 4 is adapted to normally seat in the spray nozzle 5, and means in the form of a rocker" arm 6 isadapted to engage the opposite end 7 of said needle valve, and reciprocate it within its guide housing, thus permitting a communication of the holes in the spray nozzle with the atmosphere. The central passage 3', containing the needle valve 4 is Alarge enoughV to permit a slight clearance between the needle valve 4 and the wall of the said passage, whereby fluid fuel admitted into said passage under pressure will be enabled to move therethrough and when permitted, injected into the engine cylinder.l i

In order tozplace fuel under pressure into the fuel inje'ctor unit, I have provided a' pump 8 of the plunger type, wherein a plunger 9 may be suitably reciprocated in active contact With fluid fuel to create a pressure thereon, whereby said fuel is forced from the pump chamber 10 through the back pressure valves 11 and into conduit 1 2, communicating with the fuel injector unit 2. It is intended that the'type of pumping apparatus used shall maintain a substantially continuouspressure throughout the system connecting it with the fuel injector unit 2. In order to maintain constant pressure and eliminate pulsations or Variations of pressure, on the fluidvfuel in passing from the pump to the fuelinjecting valve 2, I find 1t ood practice to by-pass and connect condult 12, by the line 14 with a pressure regulating device indicated by the reference number 15. sists of a base having a central chamber 16 adapted to receive the fluid fuel from the line 14. A spring tensioned plung'er 17, is arranged to reciprocate within said chamber 16, whereby the spring tension on the plungver 17 will automatically regulate and confrom gaining access trol the pressure, ranging from zero to.-'four thousand pounds per square inch, at which the fuel will be discharged from the fuel injector unit 2. If the pressure generated by the pump exceeds a predetermined pressure, the regulator 15 acts as a safety valve for eliminating the excess by by-passing the' over -flow fuel through the bleeder ports 18 into a reservoir 19, from which it is carried through the line 20 back into the pump chamber 10 where it may be again circulated in the system.

I have found it necessarily expedient to interpose a fluid strainer between the fuel inJector unit 2 and 'the regulator mechanisms 15, whereby any Sand, dlrt, detritus or the like will be p'revented to the fuel spray nozzle. Experiments withl various kinds and types of strainers, such' for instance as screens and various other foraminated imaterials have proven that the excessive pressure which' varies from zero to four thousand pounds per square inch in time disrupts theclarifying function of the strainer so as to make its efliciency practically nil, whereas the present strainer 21 is designed to withstand continuous usage under high pressure and also to efliciently strain fuel. The strainer eomprises a casing, cylindrical in form and having an internally threaded z p'assage 22 and the exterior opposite ends are threaded for screw engagement with respectively, the fuel valve 2 and the'commumcating conduit 12. A threaded plug 23 is adapted to be positioned within said passage 22, said plug having flattened surfaces 24 and 25 at diametrically opposite points' on opposite 'ends extending for a distanoe greater than one-half the length of said plug. Of necessity the cro-sectional The pressure regulator con-i 'threaded casing, pump 8 and pressure area of the threaded plug -will be less than internal cross-sectional area of the threaded passage 22 to, thus, permit the easy and quick removal of the said plug from the casing 21. The clearance or play between the plug threads and the passage threads to permit the reception of one within the other, leaves suflicient room to allow the movement of a fluid medium, especially. one under pressure. The inaccuracies of the threadcutting tools, although infinitesimal, are yet suificient to allow enough clearance Whereby fluid p'articles maypass or be strained While harder or impure substances Will be retained. It will thus be obvious' that oil pressure in the conduit 12, entering the space between the'fla-ttened surface 24 .and the interior surface of the casing 21, Will move through the clearance between the threaded engagements and into the passage between the flattened surface 25 and the in- 'terior surface of the casing, from whence the fluid travels to the space adjacent the needle valve 4. Th'e volume of fluid passed through the strainer is in a measure controlled by the fit between the engaging threads and by the distance that the respective' parallel surfaces on opposite sides .of the plug overlap. A strainer of this character permits of an easy removal for cleansing purposes and is designed to' withstand high pressure commensurate With! the producing of eflicient results.

Having thus described 'this invention what I claim and desire to secure by Letters Patent is .1. A strainer comprising an internally adapted to have fluid pressure conduits secured to the opposite ends thereof, and a plug screw threadedly arranged within said casing of across sectional area less than that of the internal cross section of the said casing having flattened sides that do not extend the entire length thereof.

.2. A strainer comprising a casing, adapted to have fluid pressure conduits secured to the opposite ends thereof, and a plug arranged within said casing,- of a cross sectional' area less than that of the internal cross section of said casing, said plug having flattened sides at diametrically opposite points on opposite ends th'at do not extend theentire length thereof.

P3. A strainer comprising an integrally threaded casing having a passage' therethrough; a` threaded plug of a' lesser cross' w sectional area positioned within said pasa hreaded plug adapd 'ing being arranged to have fluid pressure conduits secured to the opposite ends there' of and' a. threaded plug adapted to be positioned Within said passage, said plug hav-. ing flattened surfaces on opposite sides, and

on opposite ends that do not extend the en- 10 tire length thereof.

In 'testimony whereof7 I have hereunto set my hand at Alameda, California, this 20th day of January A1922.

In presence of-- RAL-PH A. VKNAYP.

AUG. OLIN. 

